LockStrategy


1   package org.apache.ojb.odmg.locking;
2   
3   /* Copyright 2002-2005 The Apache Software Foundation
4    *
5    * Licensed under the Apache License, Version 2.0 (the "License");
6    * you may not use this file except in compliance with the License.
7    * You may obtain a copy of the License at
8    *
9    *     http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  
18  import org.apache.ojb.odmg.TransactionImpl;
19  
20  /**
21   * this interface defines method that a Locking Strategy must implement
22   * according to the transaction isolation level it represents.
23   * @deprecated 
24   */
25  public interface LockStrategy
26  {
27  
28      /**
29       * acquire a read lock on Object obj for Transaction tx.
30       * @param tx the transaction requesting the lock
31       * @param obj the Object to be locked
32       * @return true if successful, else false
33       *
34       */
35      public boolean readLock(TransactionImpl tx, Object   obj);
36  
37      /**
38       * acquire a write lock on Object obj for Transaction tx.
39       * @param tx the transaction requesting the lock
40       * @param obj the Object to be locked
41       * @return true if successful, else false
42       *
43       */
44      public boolean writeLock(TransactionImpl tx, Object   obj);
45  
46      /**
47       * acquire a lock upgrade (from read to write) lock on Object obj for Transaction tx.
48       * @param tx the transaction requesting the lock
49       * @param obj the Object to be locked
50       * @return true if successful, else false
51       *
52       */
53      public boolean upgradeLock(TransactionImpl tx, Object   obj);
54  
55      /**
56       * release a lock on Object obj for Transaction tx.
57       * @param tx the transaction releasing the lock
58       * @param obj the Object to be unlocked
59       * @return true if successful, else false
60       *
61       */
62      public boolean releaseLock(TransactionImpl tx, Object   obj);
63  
64      /**
65       * checks whether the specified Object obj is read-locked by Transaction tx.
66       * @param tx the transaction
67       * @param obj the Object to be checked
68       * @return true if lock exists, else false
69       */
70      public boolean checkRead(TransactionImpl tx, Object   obj);
71  
72      /**
73       * checks whether the specified Object obj is write-locked by Transaction tx.
74       * @param tx the transaction
75       * @param obj the Object to be checked
76       * @return true if lock exists, else false
77       */
78      public boolean checkWrite(TransactionImpl tx, Object   obj);
79  }
80
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